Properly count entities and sure we support enough

This accounts:

- entities on the map
- entities that will be spawn to unlock doors
- the time monster

4 files changed, 10 insertions, 5 deletions

diff --git a/TODO.md b/TODO.md
index 42a186f..29fee2b 100644
--- a/TODO.md
+++ b/TODO.md
@@ -11,4 +11,3 @@
 
 # REVIEW
 
-- map: count entities (currently not taking into account doors!)
diff --git a/src/Makefile b/src/Makefile
index 6984376..0295073 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -34,8 +34,9 @@ palette.o: ../data/sprites.png
 $(IMG_OBJS): %.o: ../data/%.png
 	../tools/pngpix.py $< $@
 
+# max-ents is MAX_ENTITY - 1 to account for the time monster
 $(MAP_OBJS): %.o: ../data/%.json
-	../tools/map.py --max-ents 15 $< $@
+	../tools/map.py --max-ents 19 $< $@
 
 $(WAV_OBJS): %.o: ../data/%.wav
 	../tools/raw.py $< $@
diff --git a/src/entities.c b/src/entities.c
index 6b6c7a1..27d565a 100644
--- a/src/entities.c
+++ b/src/entities.c
@@ -9,7 +9,7 @@
 
 #include "effect.h"
 
-#define MAX_ENTITY 16
+#define MAX_ENTITY 20
 
 static Entity entities[MAX_ENTITY];
 static uint8_t last;
diff --git a/tools/map.py b/tools/map.py
index c959c50..8ead427 100755
--- a/tools/map.py
+++ b/tools/map.py
@@ -23,6 +23,9 @@ entity_types = (
     "SilverKey",
 )
 
+# these tiles are part of a door and will use an entity to unlock
+tiles_to_entity = (45, 47)
+
 
 def get_layer(data, name):
     for layer in data["layers"]:
@@ -72,6 +75,7 @@ def main():
     map_layer = get_layer(data, "Map")
 
     out = list(map(lambda x: (x - tileset["firstgid"]) & 0xFF, map_layer["data"]))
+    door_cnt = sum(map(lambda x: 1 if x in tiles_to_entity else 0, out))
 
     gold_layer = get_layer(data, "Gold")
 
@@ -90,8 +94,9 @@ def main():
     # should help the drawing order in the game
     objs_sorted = sorted(entity_layer["objects"], key=lambda o: o["y"])
 
-    if args.max_ents and len(objs_sorted) > args.max_ents:
-        parser.error("Too many entities (limit: %s)" % args.max_ents)
+    total_ents = len(objs_sorted) + door_cnt
+    if args.max_ents and total_ents > args.max_ents:
+        parser.error("Too many entities %d (limit: %s)" % (total_ents, args.max_ents))
 
     for ent in objs_sorted:
         try: